OFFICIAL SIZE & WEIGHT : These balls are constructed according to official 9.0" size and 4 ounce weight specifications SOFT CONSTRUCTION: The hollow rubber core and cushioned synthetic cover gives these teeballs a soft feel so kids of all ages can play safely DURABLE: The synthetic syntex cover and double-stitched seams are designed for maximum durability so you can play season after season HOLLOW CORE: The hollowed out core helps keep the balls light so younger kids and toddlers can throw and catch with ease LEAGUE APPROVED: These balls are approved for official game play at most levels of teeball